“互联网＋”促使传统企业系统性的变化，体现在（）。
A.生产模式改变
B.销售模式改变
C.库存模式改变
D.广告模式改变
参考答案：A, B, C, D
The parents were unsettled for the first few days, _____ about their son's safety. [ ]
A. having worried
B. to worry
C. being worried
D. worried
以发热、头痛、呕吐和脑膜刺激征为主要临床表现（）
A.流行性脑脊髓膜炎
B.肾综合征出血热
C.细菌性痢疾
D.霍乱
E.莱姆病
